Extension of 239+240Pu sediment geochronology to coarse-grained marine sediments
Continental Shelf Research
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Abstract
Sediment geochronology of coastal sedimentary environments dominated by sand has been extremely limited because concentrations of natural and bomb-fallout radionuclides are often below the limit of measurement using standard techniques. ICP-MS analyses of 239+240Pu from two sites representative of traditionally challenging (i.e., low concentration) environments provide a "proof of concept" and demonstrate a new application for bomb-fallout radiotracers in the study of sandy shelf-seabed dynamics. A kasten core from the New Zealand shelf in the Southern Hemisphere (low fallout), and a vibracore from the sandy nearshore of North Carolina (low particle surface area) both reveal measurable 239+240Pu activities at depth. In the case of the New Zealand site, independently verified steady-state sedimentation results in a 239+240Pu profile that mimics the expected atmospheric fallout. The depth profile of 239+240Pu in the North Carolina core is more uniform, indicating significant sediment resuspension, which would be expected in this energetic nearshore environment. This study, for the first time, demonstrates the utility of 239+240Pu in the study of sandy environments, significantly extending the application of bomb-fallout isotopes to coarse-grained sediments, which compose the majority of nearshore regions.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Extension of 239+240Pu sediment geochronology to coarse-grained marine sediments |
| Series title | Continental Shelf Research |
| DOI | 10.1016/j.csr.2012.01.016 |
| Volume | 36 |
| Issue | 15 |
| Year Published | 2012 |
| Language | English |
| Publisher | Elsevier |
| Publisher location | Amsterdam, Netherlands |
| Contributing office(s) | St. Petersburg Coastal and Marine Science Center |
| Description | 6 p. |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Continental Shelf Research |
| First page | 83 |
| Last page | 88 |
| Google Analytic Metrics | Metrics page |